Galvanic Corrosion Behavior for Weld Joint of High Strength Weathering Steel

doi:10.11902/1005.4537.2018.170

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (6): 527-535 DOI: 10.11902/1005.4537.2018.170

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Galvanic Corrosion Behavior for Weld Joint of High Strength Weathering Steel

HUANG Chen,HUANG Feng(

),ZHANG Yu,LIU Haixia,LIU Jing

State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China

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Abstract

The galvanic corrosion for weld joints of high strength weathering steel in simulated marine atmosphere was investigated by means of scanning kelvin probe (SKP), electrochemical noise, cyclic wet/dry accelerated corrosion test, and so on. The results indicated that the galvanic corrosion occurred on the welded joint of high strength weathering steel due to the potential difference, while the heat affected zone is the most anode area whereas the base metal is the most cathode area. And the variation of galvanic current on the base metal is differentiated as two stages of decline and stability, the corresponding time of inflexion point synchronizes with the stabilization of the rust layer. There are two stages in the corrosion process of the welded joint: the corrosion rate decreases rapidly at the initial stage of corrosion, and then remains stable in the later stage of corrosion, which may be related to its galvanic corrosion dynamics.

Key words: A710 steel welded joint galvanic corrosion SKP

Received: 04 November 2018

ZTFLH:

TG172.2

Fund: National Key R&D Program of China(2017YFB0304800)

Corresponding Authors: Feng HUANG E-mail: huangfeng@wust.edu.cn

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Cite this article:

HUANG Chen,HUANG Feng,ZHANG Yu,LIU Haixia,LIU Jing. Galvanic Corrosion Behavior for Weld Joint of High Strength Weathering Steel. Journal of Chinese Society for Corrosion and protection, 2019, 39(6): 527-535.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2018.170 OR https://www.jcscp.org/EN/Y2019/V39/I6/527

Table 1 Chemical compositions of base alloy and weld alloy (mass fraction / %)

Fig.1 Macro morphology of welded joint of A710 steel

Fig.2 Schematic diagrams for measurements of corrosion depths of A710 steel (a) and welded joint (b)

Fig.3 Measurement circuit of galvanic current of BM- (HAZ+BM) couple

Fig.4 Microstructural characteristics of BM (a), HAZ (b) and WM (c) zones of A710 welded joint

Fig.5 SKP results (mV) of A710 steel welded joint: (a) the area scan of potential difference, (b) the variation of potential with X when Y=1500 μm

Fig.6 Galvanic current of BM zone of A710 welded joint as a function of time

Fig.7 Average galvanic current of BM in the immersion stage as a function of wet/dry cyclic number

Fig.8 Corrosion rates of A710 steel and its welded joint as a function of corrosion time

Fig.9 Surface topographies of A710 weathering steel (a) and BM (b), HAZ (c) and WM (d) of the welded joint after 8 d alternating wet/dry exposure

Fig.10 Cross-sectional morphologies of the rust layers formed on A710 weathering steel (a~e) and its welded joint (f~j) after corrosion for 1 d (a, f), 3 d (b, g), 6 d (c, h), 12 d (d, i) and 24 d (e, j)

Fig.11 XRD patterns of the corrosion products formed on A710 steel (a) and its welded joint (b)

Table 2 Relative mass fractions of α-FeOOH and values of α/γ* in the corrosion products formed on A710 steel and its welded joint after corrosion for 3, 12, 24 d

Fig.12 Impedance values of A710 steel (a) and its welded joint (b) as a function of frequency

Fig.13 Impedance values of A710 weathering steel and its welded joint at 10 mHz (a) and 10 kHz (b)

Fig.14 Galvanic corrosion models of A710 steel welded joint at the initial corrosion stage (a, b) and the later corrosion stage (c)

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